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  1. #1

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    Battery charging output on Ultra LX !!

    I currently have a 2010 Ultra LX with a single Yuasa YTX 20H-BS (18AMP hour / 375CCA) battery.

    The YUASA is the recommened battery as per workshop manual..

    My question is -
    1. Does the generator/stator output for the Ultra LX have the capability of charging a "larger" than standard battery - DEKA ETX30LA (Powersports battery) - 29AMP hour/400CCA)?
    The workshop manual tells me that the maximum generator output is 16Amps at 14V......

    Cheers.........


  2. #2

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    Charging 2 x batteries on Ultra LX

    Quote Originally Posted by sirbreaksalot View Post
    Charging isn't the issue, its his much current you are drawing whilst the ski is stopped,
    By that I mean if you almost flatten it every time you stop and then expect the ski to refill it you are going to over tax the out out side of things....

    If you just want more battery in reserve for the in case situation then nothing to worry about.

    Waz
    Hi Waz....thanks for the feedback.....

    I will not be drawing much from the battery other than a GPS/Plotter/sounder combo unit, which uses 1amp per hour max. So you are probably right, bigger battery for more reserve.

    However it was a bit of a loaded question because....

    I will be using a BEP voltage sensing relay unit which basically charges the first battery till it reaches 13.7 volts, the relay then opens and charges both batteries in parallel.

    The question now is...will the generator/stator output be enough to charge two batteries in parallel...1 x Deka 29amp & 1 x Deka 18amp?

    Cheers...............

  3. #3
    nicjak's Avatar
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    of course one will feed the other same deal you are only ever topping up depleted reserves.

  4. #4

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    Quote Originally Posted by nicjak View Post
    of course one will feed the other same deal you are only ever topping up depleted reserves.
    Good point, never really saw things from that angle. I now see where Waz was going with his reply.

    Relooking at the situation, I do start the ski quite a few times during a trip...mainly drift fishing or drift spearfishing, then back up to top of the reef.

    So I thought battery voltage would drop quite a bit and stator output was not enough to charge both batteries in this case.l

    Lets say I start the ski at least twenty times or even more!! in five or six hours and then only have the ski at low rev's moving back up current...will the battery voltage drop be substancial..20%, 30%, 50%??

  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    I don't know what rpm the charging system makes peak output, how long do you idle/low rpm between stops?

    you could probably get an estimate by checking the voltage between starts but it would just be an estimate.

    Sean

  6. #6
    nicjak's Avatar
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    i think your battery drop will be neglible and not really worth the worry you are putting into it,

  7. #7

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    Quote Originally Posted by nicjak View Post
    i think your battery drop will be neglible and not really worth the worry you are putting into it,
    I think you guy's may be right..........probably not worth worrying about...and measuring voltage whilst at sea can be a pain....

    I guess I've still got bad memories of having a flat battery 70KM offshore...not a nice feeling ...hence the dual battery system now in place and the worry factor still quite high.

  8. #8
    nicjak's Avatar
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    no need to test at sea you could test it in your garage all day

  9. #9
    Self Confessed Day Dreamer toomanytoys's Avatar
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    If you were paranoid you could just fit a voltage gauge in the clovebox.

    My other advice, change your battery every 2 ˝ years for peace of mind.

  10. #10
    john07ex's Avatar
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    Where did you install the 2nd battery? I am looking to do a dual setup for sure. Or would a new 14 lx the one with the built in stereo have a better alternator?

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